﻿

using System;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.IO;
using System.Net;
using System.Web.Services.Description;
using Microsoft.CSharp;
using System.Reflection;
using Kevin.Framework.Cache;

/*  
 * 创建人：席吉波
 * 
 * 日期：  2010-09-11
 * 
 * 用途：  根据Url && MethodName 动态调用WebService
 *   
 */

namespace Kevin.Controls
{
    /// <summary>
    /// 动态调用WebService 创建人：席吉波
    /// </summary>
    public class DynamicInvokWebService
    {

        /// <summary>
        /// 动态调用WebService 创建人：席吉波
        /// </summary>
        /// <param name="url">Web服务路径 譬如 :http://host/yourServiceName.asmx</param>
        /// <param name="methodname">web服务名</param>
        /// <param name="args">参数</param>
        /// <returns></returns>
        public static object InvokeWebService(string url, string methodname, object[] args)
        {
            return InvokeWebService(url, null, methodname, args);
        }

        public static object InvokeWebService(string url, string classname, string methodname, object[] args)
        {
            string @namespace = "KevinXi.WebService.DynamicWebCalling";
            if ((classname == null) || (classname == ""))
            {
                classname = GetWsClassName(url);
            }

            try
            {
                System.Reflection.Assembly assembly = null;
                if (ServiceAssemblyChache.Instance.Contains(@namespace))
                {
                    assembly = (System.Reflection.Assembly)ServiceAssemblyChache.Instance.GetData(@namespace);
                }
                else
                {
                    //获取WSDL
                    WebClient wc = new WebClient();
                    Stream stream = wc.OpenRead(url + "?WSDL");
                    ServiceDescription sd = ServiceDescription.Read(stream);
                    ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
                    sdi.AddServiceDescription(sd, "", "");
                    CodeNamespace cn = new CodeNamespace(@namespace);

                    //生成客户端代理类代码
                    CodeCompileUnit ccu = new CodeCompileUnit();
                    ccu.Namespaces.Add(cn);
                    sdi.Import(cn, ccu);
                    CSharpCodeProvider csc = new CSharpCodeProvider();
                    ICodeCompiler icc = csc.CreateCompiler();

                    //设定编译参数
                    CompilerParameters cplist = new CompilerParameters();
                    cplist.GenerateExecutable = false;
                    cplist.GenerateInMemory = true;
                    cplist.ReferencedAssemblies.Add("System.dll");
                    cplist.ReferencedAssemblies.Add("System.XML.dll");
                    cplist.ReferencedAssemblies.Add("System.Web.Services.dll");
                    cplist.ReferencedAssemblies.Add("System.Data.dll");

                    //编译代理类
                    CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
                    if (true == cr.Errors.HasErrors)
                    {
                        System.Text.StringBuilder sb = new System.Text.StringBuilder();
                        foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors)
                        {
                            sb.Append(ce.ToString());
                            sb.Append(System.Environment.NewLine);
                        }
                        throw new Exception(sb.ToString());
                    }
                

                    //生成代理实例，并调用方法
                    assembly = cr.CompiledAssembly;
                    ServiceAssemblyChache.Instance.Add(@namespace, assembly);
                }
                Type t = assembly.GetType(@namespace + "." + classname, true, true);
                object obj = Activator.CreateInstance(t);
                System.Reflection.MethodInfo mi = t.GetMethod(methodname);

                return mi.Invoke(obj, args);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));
            }
        }

        private static string GetWsClassName(string wsUrl)
        {
            string[] parts = wsUrl.Split('/');
            string[] pps = parts[parts.Length - 1].Split('.');

            return pps[0];
        }
    }

    
}
